Born in Toronto, Ontario on June 12th, 1927 goaltender Robert Decourcy played his Junior hockey in Ontario then turned pro with the New York Rovers during the 1946-47 season. Decourcy had started his second season of professional hockey when he received a call from the New York Rangers.

On November 12th, 1947 Ranger netminder Chuck Rayner was felled by an injury in the second period of a game versus the Boston Bruins and Decourcy came in as his replacement. The Bruins showed no mercy to the rookie netminder making his NHL debut and scored six goals during the 29 minutes Decourcy played. It would prove to be his only stint in the big leagues.

Decourcy began a three-year run in the United States Hockey League toward the end of that season. In 1950 Decourcy retired as a professional and elected to play the final year of his career in Senior hockey. Decourcy signed on with the St. Michael's Monarchs, a fitting end for a player that began his career with the St. Michael's Majors.